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Educreations - Educreations is a unique interactive whiteboard and screencasting tool that's simple, powerful, and fun to use. Annotate, animate, and narrate nearly any type of content as you explain any concept. Free app available for download in iTunes.
TED-Ed - a tool to build a lesson around any Ted-Ed original, Ted Talk or YouTube video. You need to register a free account first.
PowToon - a tool to create animated videos and presentations.